Hugh laird



@auch gisten gateat @ffice HUGH LAIRD, F MECHANIGSBURG, PENNSYLVANIA.

Lettere Patent-No. 74,918, datati February 25, 1868.

Irrel-roven Turnen.

dlgs Santilli maar tuA in tlgesc tas ntmt :mi matting gat at tige sante,

.IOALL WHOM IT MAY GONCERN:

Be it known that I, HUGH' LAIRD, of- Mechanicsburg, in the county of Cumberland, and State of Pennsylvania, have invented a new anduseful Improvement in Tuyeres; and I do hereby declare the following to be a clearand exact description of the nature thereof, snihcient to enableothers skilled in the-art: to which it appertains to fully understand and use the same, reference being had to the accompanying drawings,'making part of this specification, in which- Figure l is a side elevation.

Figure 2 isa central vertical section in the line n: ft', l.

Figure 3 is a similar view in line y y, tig'. 2.

' Similar letters of -reference indicate corresponding parts in the several figures. I

My invention consists in placing a valve within a recess in the side ofthe air-chamber vof a tuyere, so that when the blast of air from the bellows shall cease, fresh air shall be admitted into the chamber to cool the grate, and prevent the extinguishing of there, all as will be hereinafter more fully described.

In the drawings, Arcpresents the air-chamber or reservoir, lof usual form, and supporting the detachable {ire-grate B. Thebottom of the reservoir has a conical opening, -into which tsthe conical plug C of the lever D, 'which isniountcd on the projecting arm E, secured to one side of the reservoir. It is evident that if it be desired to remove 4the ashes, cinders, or coals from the forge or fireplace, the grate being removed, they will drop into the chamber, andthe contents therein will readily have an outlet when the conical plug C is withdrawn from the opening a. rv The advantages of the conical shapes ofthe plug and opening arethat they are 'nccessaryto the completion of a closed chamber. ne more tho plug is forced into the opening, the .tighter will the joint between them become, consequently there is little or no chanac for the escape of air. When the ashes or cinders shall have passed the top edge ofthe bottom, they will have free exit on account ofthe tapering form ofthe opening a, whereby there will be no4v lodgment or clogging in the opening. This will also allow `the ready return of the plug in place. vFis a pipe for conveying air from the bellows into the chamber. It is suitably secured to` one side'ol the chamber, and is of ordinary form and construction. On the inside of the chamber, I 'form a recess, G, having an opening, b, communicating with the atmosphere. A valve, H, is suspended within the recess, and covers the opening Zi; I secure the valve to suitable arms, which are hinged to the chamber, whereby the valve has a swinging motion, and always will fit over'the opening b.

rIhe valve may be constructed of metal, leather, or other suitable material, and may have 4other means of attachment to the chamber than that/described.

rlfhe operationis as follows: Air is forced into the chamber A through the pipe F. It willv immediately free the air-chamber and closethe valve H, whereby no air can enter the chamber, except such'as is forced therein by `the bellows. The grate B will become heated by the iire, and the air, as it passes through the grate, will also be heated and assist combustion. So soon as the blast ceases, the valve H will open and allow the admission of ordinary air. This will cool the grate-B and; prevent its burning out, as also keep theiire burr.- ing. When the ashes pass through thc grate, or thc cinders are allowed to drop into the chamber, the valve being within the recess, and out of the way of the falling matter, will be free to open and shut. Should a quantity rest or lodge in the recess, the valve will not be clogged, for it is placed. above the bottom of the recess, and consequently operates wit-hout hindrance. As theair-chambers are generally of tapering form, or the form of an inverted pyramid, the ashes, Ste., arcdirected to the centre of thc bottom, where they can be quickly removed.VA A ll t'hc'pa-rts of my tuyere arc simple in construction, and none are in the way`of`each other, so as tocomplicate the operation thereof, and I therefore consider my invention practical and useful.

i Having thus described my invention, what I claim as new,` and desire tosecnre by Letters Patent, is-

v Thecombination of airchamber A, valve-recess G, valve II, plug C, and lever D, arranged substantially as described. s Y

To the above, l have sign-ed my name, this 15th day of August, 1867.

l a HUGH LAIRD.

Witnesses: v

` DAVID HEIGBY,

JOHN A. Wlnnnnsnnm.. 

